（C）学生成绩管理系统

  1 #include <stdio.h>
  2 #include <string.h>
  3 #include <stdlib.h>
  4 #include <unistd.h>
  5 
  6 struct Student
  7 {
  8     char id[4];
  9     char name[10];
 10     int score;
 11 };
 12 
 13 typedef struct User
 14 {
 15     char userName[20];
 16     char userPassword[10];
 17 }UserInfo;
 18 
 19 void inputNameAndPassword();
 20 void logon();
 21 void creatDataBace();
 22 void selectServe();
 23 void checkAchievement();
 24 void addAchievement();
 25 void delectAchievement();
 26 void changeAchievement();
 27 void sortAchievement();
 28 void start();
 29 
 30 int main(int argc, const char * argv[])
 31 {
 32     start();
 33     //清屏未实现
 34     system("clear");
 35         
 36     FILE *file;
 37     file=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt", "r+");
 38     struct Student aStudent;
 39     if (fread(&aStudent, sizeof(struct Student), 1, file)==0) {
 40         creatDataBace();
 41     }
 42     fclose(file);
 43     //清屏未实现
 44     
 45     selectServe();
 46     
 47     return 0;
 48 }
 49 
 50 void start()
 51 {
 52     int land;
 53     printf("1.注册
2.登陆
");
 54     scanf("%d",&land);
 55     if (land==1) {
 56         logon();
 57     }else
 58     {
 59         if (land==2)
 60             inputNameAndPassword();
 61         else
 62         {
 63             printf("输入有误，请重新选择
");
 64             start();
 65         }
 66      }
 67 }
 68 
 69 void logon()
 70 {
 71     UserInfo userInput;
 72     printf("
------------------注册用户------------------");
 73     printf("
请输入注册用户名：");
 74     scanf("%s",userInput.userName);
 75     printf("请输入密码：");
 76     scanf("%s",userInput.userPassword);
 77     FILE *fp;
 78     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/user_password.txt", "a+"))==NULL)
 79     {
 80         printf("注册失败！");
 81         exit(0);
 82     }
 83     if ((fwrite(&userInput, sizeof(UserInfo), 1, fp))!=1) {
 84         printf("注册失败！");
 85         exit(0);
 86     }
 87     fclose(fp);
 88     inputNameAndPassword();
 89 }
 90 
 91 void inputNameAndPassword()
 92 {
 93     UserInfo userInput,userBase[50];
 94     int i=0,count=0,chance=0;
 95     
 96     FILE *fp;
 97     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/user_password.txt", "r"))==NULL)
 98     {
 99         printf("登陆失败！");
100         exit(0);
101     }
102     
103     while(fread(&userBase[i], sizeof(UserInfo), 1, fp)!=0)
104         i++;
105     count=i;
106     fclose(fp);
107     
108     printf("
------------------用户登陆------------------
");
109     while (1)
110     {
111         printf("用户名：");
112         scanf("%s",userInput.userName);
113         printf("密码：");
114         scanf("%s",userInput.userPassword); //密码用星号代替未实现
115         
116         for (i=0; i<count; i++) {
117             if((strcmp(userInput.userName, userBase[i].userName)==0)&&(strcmp(userInput.userPassword, userBase[i].userPassword)==0))
118                 return;
119         }
120         if (chance!=3)
121             printf("
用户名或密码输入错误，请重新输入（还有 %d 次机会）：
",3-chance);
122         chance++;
123         if (chance>=4) {
124             printf("
尝试超出次数！退出程序。");
125             exit(0);
126         }
127     }
128 }
129 
130 void selectServe()
131 {
132     int serveNumber;
133     printf("
------------------操作菜单------------------");
134     printf("
1.查询学生成绩
2.添加学生成绩
3.删除学生成绩
4.修改学生成绩
5.查看成绩排名
");
135     printf("
请选择您需要的操作(输入序号选择，输入其它退出程序）:");
136     scanf("%d",&serveNumber);
137     switch (serveNumber) {
138         case 1:
139             checkAchievement();
140             break;
141         case 2:
142             addAchievement();
143             break;
144         case 3:
145             delectAchievement();
146             break;
147         case 4:
148             changeAchievement();
149             break;
150         case 5:
151             sortAchievement();
152             break;
153         default:
154             break;
155     }
156     printf("
 ^^ 再见.....");
157 }
158 
159 void creatDataBace()
160 {
161     FILE *fp;
162     struct Student student[100];
163     int flag=0;
164     int i=0;
165     int k=0;
166     int count=0;
167     int m=0;
168     char ch;
169     
170     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt", "r"))==NULL)
171     {
172         printf("打开文件错误！");
173         exit(0);
174     }
175     
176     for (i=0;fread(&student[i], sizeof(struct Student), 1, fp)!=0;i++);
177     count=i;
178     fclose(fp);
179     
180     printf("
------------------初始化数据库------------------");
181     i=0;
182     while (1) {
183         printf("
请输入学生的基本信息:
");
184         do
185         {
186             printf("第 %d 个学生的ID号：",i+1);
187             scanf("%s",student[i].id);
188             
189             for (k=i-1; k>=0; k--) {
190                 if(strcmp(student[i].id, student[k].id)==0)
191                 {
192                     printf("
ID号已存在，请重新输入
");
193                     flag=1;
194                     break;
195                 }
196             }
197             
198             for (k=0; k<count; k++) {
199                 if(strcmp(student[i].id, student[k].id)==0)
200                 {
201                     printf("
ID号在整个数据库中已存在，请重新输入
");
202                     flag=1;
203                     break;
204                 }
205             }
206         }while(flag);
207         
208         do
209         {
210             flag=0;
211             printf("学生名称：");
212             scanf("%s",student[i].name);
213         }while (flag);
214         
215         do
216         {
217             flag=0;
218             printf("学生成绩：");
219             scanf("%d",&student[i].score);
220             if (student[i].score>100||student[i].score<0) {
221                 flag=1;
222                 continue;
223             }
224         }while (flag);
225         
226         i++;
227         m++;
228         printf("
是否继续创建学生成绩信息？输入'y'或'Y'继续，输入其它进入下一步：");
229         getchar();
230         scanf("%c",&ch);
231         if (ch!='Y'&&ch!='y')
232             break;
233     }
234     
235     
236     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt", "a"))==NULL)
237     {
238         printf("打开文件错误！");
239         exit(0);
240     }
241     
242     for (i=0; i<m; i++) {
243         if (fwrite(&student[i], sizeof(struct Student), 1, fp)!=1)
244             printf("数据保存失败");
245     }
246     
247     fclose(fp);
248 }
249 
250 void checkAchievement()
251 {
252     struct Student student;
253     char id[4];
254     FILE *fp;
255     
256     printf("
------------------查询学生成绩------------------
");
257     printf("请输入需要查询的学生ID：");
258     scanf("%s",id);
259     while (1)
260     {
261         if ((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt","r"))==NULL)
262         {
263             printf("打开文件错误！");
264             selectServe();
265         }
266         
267         while (fread(&student, sizeof(struct Student), 1, fp)!=0) {
268             if (strcmp(id,student.id)==0) {
269                 printf("ID:%s  姓名:%s  分数:%d
",student.id,student.name,student.score);
270                 break;
271             }
272         }
273 
274         if (strcmp(id,student.id)!=0)
275             printf("没查找到ID为 %s 的学生信息。
",id);
276         
277         printf("
请输入需要查询的学生ID（输入n返回操作菜单）：");
278         scanf("%s",id);
279         if (strcmp(id,"n")==0||strcmp(id,"N")==0) {
280             fclose(fp);
281             selectServe();
282         }
283         fclose(fp);
284     }
285 }
286 
287 void addAchievement()
288 {
289     FILE *fp;
290     struct Student student[100];
291     int i=0;
292     int count=0;
293     char ch;
294     
295     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt", "r"))==NULL)
296     {
297         printf("打开文件错误！");
298         selectServe();
299     }
300     
301     for (i=0;fread(&student[i], sizeof(struct Student), 1, fp)!=0;i++);
302     count=i;
303     fclose(fp);
304     
305     if((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt", "a+"))==NULL)
306     {
307         printf("打开文件错误！");
308         selectServe();
309     }
310     
311     printf("
------------------添加学生成绩------------------");
312     while (1)
313     {
314         int flag;
315         do {
316             flag=0;
317             printf("
请输入需要添加的学生ID：");
318             scanf("%s",student[count].id);
319             for (int k=0; k<count; k++) {
320                 if(strcmp(student[count].id, student[k].id)==0)
321                 {
322                     printf("ID号在数据库中已存在，请重新输入。
");
323                     flag=1;
324                     break;
325                 }
326             }
327         } while (flag);
328         printf("请输入需要添加的学生姓名：");
329         scanf("%s",student[count].name);
330         printf("请输入需要添加的学生分数：");
331         scanf("%d",&student[count].score);
332         if (fwrite(&student[count], sizeof(struct Student), 1, fp)!=1) {
333             printf("添加失败！");
334         }
335         printf("添加成功！
");
336         printf("
是否继续添加学生成绩信息？输入y继续，输入其它返回操作菜单：");
337         getchar();
338         scanf("%c",&ch);
339         if (ch!='y'&&ch!='Y') {
340             fclose(fp);
341             selectServe();
342         }
343         count++;
344     }
345 }
346 
347 void delectAchievement()
348 {
349     char id[4];
350     char sure;
351     FILE *infile,*outfile;
352     struct Student students[100];
353     int i=0,flag=-1,count=0;
354     
355     
356     printf("
------------------删除学生成绩------------------");
357     
358     if ((infile=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt","r"))==NULL)
359     {
360         printf("打开文件错误！");
361         selectServe();
362     }
363     
364     while (fread(&students[i], sizeof(struct Student), 1, infile)!=0) i++;
365     count=i;
366     fclose(infile);
367     
368     printf("
请输入需要删除的学生ID：");
369     scanf("%s",id);
370     while (1)
371     {
372         for (i=0; i<count; i++) {
373             if (strcmp(id,students[i].id)==0) {
374                 flag=i;
375                 break;
376             }
377         }
378         
379         if (flag==-1)
380             printf("没查找到ID为 %s 的学生信息。",id);
381         else
382         {
383             printf("确认要删除ID为 %s 的学生信息吗？（y确定 n取消）",id);
384             getchar();
385             scanf("%c",&sure);
386             if (sure=='y')
387             {
388                 for (i=flag; i<count-1; i++) {
389                     students[i]=students[i+1];
390                 }
391                 count--;
392             
393                 outfile=fopen("/Users/5000/Desktop/C:OC作业/Final Project/temp.txt","w+");
394                 for (i=0; i<count; i++) {
395                     if(fwrite(&students[i], sizeof(struct Student), 1, outfile)!=1)
396                     {
397                         printf("删除失败！");
398                         selectServe();
399                     }
400                 }
401                 fclose(outfile);
402             }
403             printf("删除成功！
");
404         }
405         
406         printf("
请输入需要删除的学生ID（输入n返回操作菜单）：");
407         scanf("%s",id);
408         
409         if (strcmp(id,"n")==0||strcmp(id,"N")==0) {
410             /*其实用w打开原来文件就可以直接写入原来的文件，w打开会清空原来文件的内容*/
411             unlink("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt");//#include <unistd.h>
412             rename( "/Users/5000/Desktop/C:OC作业/Final Project/temp.txt","/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt");//#include <unistd.h>
413             selectServe();
414         }
415     } 
416 }
417 
418 void changeAchievement()
419 {
420     FILE *fp;
421     char id[4],ch;
422     int score=0,count=0,flag=1;
423     int i=0;
424     struct Student students[100];
425     
426     if ((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt","r"))==NULL)
427     {
428         printf("打开文件错误！");
429         selectServe();
430     }
431     while (fread(&students[i], sizeof(struct Student), 1, fp)!=0) i++;
432     count=i;
433     fclose(fp);
434     
435     printf("
------------------学生成绩排名------------------
");
436     while (1)
437     {
438         printf("请输入需要修改成绩的学生ID：");
439         scanf("%s",id);
440 
441 
442         for (i=0;i<count;i++) {
443             if (strcmp(id,students[i].id)==0) {
444                 printf("ID为 %s 的%s同学，分数为:%d
",students[i].id,students[i].name,students[i].score);
445                 printf("更改%s同学的分数值为：",students[i].name);
446                 scanf("%d",&score);
447                 students[i].score=score;
448                 flag=0;
449                 break;
450             }
451         }
452         
453         if (flag)
454             printf("没查找到ID为 %s 的学生信息。
",id);
455         
456         if ((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt","w+"))==NULL)
457         {
458             printf("打开文件错误！");
459             selectServe();
460         }
461         for (i=0; i<count; i++) {
462             if(fwrite(&students[i], sizeof(struct Student), 1, fp)!=1)
463             {
464                 printf("修改失败！");
465                 selectServe();
466             }
467         }
468         
469         printf("
是否继续查询学生成绩信息？输入'y'或'Y'继续，输入其它返回操作菜单：");
470         getchar();
471         scanf("%c",&ch);
472         if (ch!='y'&&ch!='Y') {
473             fclose(fp);
474             selectServe();
475         }
476     }
477 }
478 
479 void sortAchievement()
480 {
481     char ch;
482     FILE *fp;
483     struct Student students[100],temp;
484     int i=0,j=0,count=0;
485     
486     if ((fp=fopen("/Users/5000/Desktop/C:OC作业/Final Project/achievement.txt","r"))==NULL)
487     {
488         printf("打开文件错误！");
489         selectServe();
490     }
491     
492     while (fread(&students[i], sizeof(struct Student), 1, fp)!=0) i++;
493     fclose(fp);
494     count=i;
495     
496     printf("
------------------学生成绩排名------------------
");
497     for(i=0;i<count-1;i++)
498         for(j=0;j<count-1-i;j++)
499         {
500             if (students[j].score<students[j+1].score) {
501                 temp=students[j];
502                 students[j]=students[j+1];
503                 students[j+1]=temp;
504             }
505         }
506     printf("ID    Name      Score
"); //Id****Name******Score
507     for (i=0; i<count; i++) {
508         printf("%s",students[i].id);
509         for (j=0; j<6-strlen(students[i].id); j++) 
510             printf(" ");
511         
512         printf("%s",students[i].name);
513         for (j=0; j<10-strlen(students[i].name); j++) 
514             printf(" ");
515             
516         printf("%d
",students[i].score);
517     }
518     
519     printf("
输入任意键返回操作菜单：");
520     getchar(); //接收选择操作4时输入的回车
521     scanf("%c",&ch);
522     selectServe();
523     
524 }


运行截图：





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原文地址：https://www.cnblogs.com/mingfung-liu/p/3156780.html